Triodus
Sign in to savethumb|left|Restoration of T. sesselensis
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thumb|left|Restoration of T. sesselensis
Triodus is an extinct genus of xenacanthiform cartilaginous fish that lived from the Carboniferous to the Permian. In 2017, a new species Triodus richterae was described from the Rio do Rasto Formation of Brazil.
Excerpted from Wikipedia’s “Triodus” article, available under the CC BY-SA 4.0 licence.